Watermom has a great point (As Always) ... Tri-Chlor is now adding additional CYA that you "may not" need at this point... especially if you now have "socks" of stabilizer in the pool.... the straight unscented, "cheapest you can find" 8.25% bleach is Calcium Hypo (chlorine) no additives, no inert material etc.. That IS THE BEST way to sanitize your water as it gives you total control of what you're actually putting into your water...